/*
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.firebase.database.core.persistence;

public interface CachePolicy {

  CachePolicy NONE =
      new CachePolicy() {
        @Override
        public boolean shouldPrune(long currentSizeBytes, long countOfPrunableQueries) {
          return false;
        }

        @Override
        public boolean shouldCheckCacheSize(long serverUpdatesSinceLastCheck) {
          return false;
        }

        @Override
        public float getPercentOfQueriesToPruneAtOnce() {
          return 0;
        }

        @Override
        public long getMaxNumberOfQueriesToKeep() {
          return Long.MAX_VALUE;
        }
      };

  boolean shouldPrune(long currentSizeBytes, long countOfPrunableQueries);

  boolean shouldCheckCacheSize(long serverUpdatesSinceLastCheck);

  float getPercentOfQueriesToPruneAtOnce();

  long getMaxNumberOfQueriesToKeep();
}
